There are some seriously untapped alternative interpretations for Cruella de Vil.
In the book she has a husband who’s simply known as Mr. de Vil (later given the first name Harry). She supposedly only married him because he’s a furrier and he’s little more than an extension to his wife. She even forced him to take her last name. He’s described as a small, worried looking man which isn’t much but compared to how other characters are described it probably means he’s shorter than most women and looks tiny next to his unusually tall wife, is slim but not thin and otherwise looks average. Other characters express worry for him because he’s married to Cruella but Cruella’s cat assures them he is just as evil as her. According to the cat Cruella is strong and bad and her husband is weak and bad. Basically, either he never gets to have sex with his wife or she pegs him. There’s no in between.
But even stranger, Cruella is heavily implied to be either an actual real demon from hell or the descendant of one. She’s always cold which is why she loves furs and she force her husband to keep their house boiling hot despite his suffering. She also loves hot spicy food, even spicy ice cream, again to her husband’s dismay. When they eat out he only eats the blandest food he can get.
And Mr. de Vil most likely knows about his wife’s true nature. When a puppy runs off while hidden under Cruella’s coat she screams that it must be bewitched while Mr. de Vil immediately jumps to the conclusion that it must be one of her dead/devilish ancestors who has come to take it away.
Make of that what you want. Considering Mr. de Vil is as evil as Cruella he could have summoned her and she just decided to stay and make him her anchor to this world.